Byte Size Converter
Every unit at once. Decimal units (KB, MB, GB) step by 1000 and binary units (KiB, MiB, GiB) step by 1024 — which is why a 500 GB drive reports 465.66 GiB.
= 500,000,000,000 bytes
| Unit | Scale | Value |
|---|---|---|
| bit | Bits | 4,000,000,000,000 |
| B | Decimal (SI, ×1000) | 500,000,000,000 |
| KB | Decimal (SI, ×1000) | 500,000,000 |
| MB | Decimal (SI, ×1000) | 500,000 |
| GB | Decimal (SI, ×1000) | 500 |
| TB | Decimal (SI, ×1000) | 0.5 |
| PB | Decimal (SI, ×1000) | 0.0005 |
| KiB | Binary (IEC, ×1024) | 488,281,250 |
| MiB | Binary (IEC, ×1024) | 476,837.16 |
| GiB | Binary (IEC, ×1024) | 465.66 |
| TiB | Binary (IEC, ×1024) | 0.454747 |
| PiB | Binary (IEC, ×1024) | 0.000444 |
Byte Size Converter — Free Online Tool
Converts data sizes between bytes, decimal SI units (KB, MB, GB, TB, PB at 1000) and binary IEC units (KiB, MiB, GiB, TiB, PiB at 1024), plus bits, showing every unit at once so the 1000-versus-1024 discrepancy behind mismatched disk and RAM figures is visible, and accepting input written with or without a space.
How to use the Byte Size Converter
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
Why does 500 GB show as 465.66 GiB?
Because they are different units. A GB is 1,000,000,000 bytes (decimal, SI) and a GiB is 1,073,741,824 bytes (binary, IEC). Drive manufacturers advertise in GB while operating systems report in GiB, which is where the missing 7% goes.
Which unit should I use in my own code?
Whichever your audience reads — but label it honestly. Memory and file sizes are conventionally binary (MiB, GiB), while network throughput and storage marketing are decimal. Writing MB when you mean MiB is the actual source of most confusion.
Why are bits included?
Because bandwidth is quoted in bits and file sizes in bytes. A 100 Mbps link transfers at most 12.5 MB/s, and that factor of eight explains a lot of apparently slow downloads.
Free & private — why use this Byte Size Converter
The Byte Size Converter runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.